This is a kit that converts the H4 series 120x120mm board to the Mini-ITX form factor 170x170mm, one of the PC industry standards. It is designed so that you can use a general-purpose PC PSU and your H4 series board together in an ITX-compatible case that can be easily found on the market.
24-Pin female ATX PSU starter on/off switch jumper bridge cable and an IDE-to-DC Plug cable are included. Therefore, you can supply power to the H4 with a general PC PSU. A rear side bracket cover for the PC case is also included.
More information : https://www.hardkernel.com/shop/h4-mini-itx-kit/